Air filter



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AIR FILTER Filed March 8, 1926 0.9

Idd/ard@ Patented, 'July 24,1928. y UNITED ASTATES i 1,678,044 PATENT foFFICE.

EDWARDRQHWITT, oF MIDVALE, NEW JERSEY,- AND ALFEED F. FIASUEY, oF NEW YORK, N. Y., AssIeNons To INTERNATIONAL Moron. COMPANY, oF NEW Yonx, N. Y.,

A GORPORATION 0F DELAWARE.

AIR FILTER.

Application led March 8, 1926. Serial No. 93,024.

Great difficulty has been experienced lin supplying clean air to the carburetors of 1nternal combustion motors and varlous forms of screens or filters have been suggested,.the

purpose of which has been to remove for-1 very great. v

The object of the present'mventlon 1s to provide a filter which is highly 'efiiclent 1n removing the harmful foreign particles from the air supplied to the carburetor of an internal combustion motor and which re quires-little or no attention in operation. Its use is particularly advantageous 1n rall cars where great volumes of air are con.- sumed and where the necessity of cleaning such air becomes very great.

Reference will now be had to the accom- -a1r passing through the screen should be panying drawings for a more detailed description of the device wherein:

Figure 1 shows a side elevation, partly 1n section, of a form of the proposed device.

Figure 2 shows a front elevation partly in section` of the rotor and air conduit.

In Figure 1, a designates a suitable electric motor with an armature shaft a extending outwardly and journaled at its end in a suitable bearing in the conduit section. Conduit b carries the air to the carburetor and is provided with a bearing b in which the armature shaft is mounted. The con- 'duit is provided at its end withA an annular iiange b2 Awhich serves as a bearing to prevent air from reaching the conduit without passing through the screen.

Mounted on the shaft a is a rotor c which is suitably keyed at its hub c to said shaft bya key c2. The rotor is of a spider formation with arms cs which carry, at their outer extremities, outwardly extending diverging walls c* which may, if desired, becurved or straight as shown.

Discs cl5 are mounted on the spider byy bolts e and vspacers c". At the outer extremities of the diverging walls c* screens e8 are secured. and extend therefrom tol the discs c5 to which they are secured. yRim e9 may clamp the screen to the walls. The disc c5 which abuts flange b2 is provided with a central aperture cmwhich co-operates'with.

the conduit b thereto. v

,A sleeve cl is mounted on-shaft a between to permit free flow of air the motor and the rotor and is provided.

with a flange d which seats a spring d. This spring insures a close contact between disc o and flange b2 and prevents air from passin therethrough.

In t e operation of this device the filter,

ing depends upon the speed of rotation of thel screen rather than its mesh, and it is therefore given a definite and constant speed of rotation. The electric motor shown may be very small, since the device requires little power to operate it. The center of thescreen is covered up by the discs so that a definite speed is given to the screen at its smallest diameter.

It is understood that the speed of the screenis not related to the speed of the engine itself, although such could be the case if necessary or desirable. The speed ofthe substantially less than the rate of revolution of the screen itself. The particles of dust and dirt carried by the air are hit by the wires of the screen and bounced off at right angles tothe air stream.

It has been found that when the velocity of the screenis 1136 times the speed of the air stream, all the larger particles are thrown off and the only particles which pass through are very minute and would probably pass through a three or four hundred mesh. The above was found to be true after introducing a continuous flow ofmolders sand into the air stream at a point directly in front of the screen. With a screen veloc` vice is provided which lis highly eilicient What I claim is:

and Which-may be used with' great advantage Where particularly large volumes of' ceivinga ltered medium, a shaft Journaled at one end inthe conduit, a rotor mounted air are desired.

1. In al filtering dev-ice, a hollowl rotor,

the outer side thereof formed as outwardly diverging Walls extending from an inwardly located apex to the outer end extremitles o1' each transverse side of the rotor, screens mounted in the transverse sides thereof, means to Withdraw a filtered medium from the interior of the rotor and means to rotate the same. l l

2. In a filtering device, a rotorfcomprising a hub, a spiderimounted thereon, outwardly extending diverging Walls carried by the spider, spaced discs axially mounted on opposed sides of the spider and in the plane 4 of the outer extremities of the diverging Walls, annular screens mounted between said extremlties and said discs, meaiis to with draw the filtered medium fromthe rotor and .means to rotate the same.

3. In a filtering device, a conduitrfor reon the' shaft and comprising a hub, a spider mounted thereon, outwardly extending divergng walls carfried'gby the spider, spaced discs laxially mounted on op osed sides of the spider and in the plane o the outer extremities of thg diverging Walls, annular screens mounted between said extremities and said discs, an annular Bange on the conduit and abutting one of the spaced discs, an aperture in said last named disc communieating With the conduit, means for urging the rotor against the flange and means for rotating said Isha-ft. and rotor.

This specication signed this 5th day of March A. D. 1926. 'I

EDWARD R. HEWITT.

ALFRED F. MASURY. 

